Glen Cannich (Scottish Gaelic: Gleann Chanaich) is a long glen in the Northwest Highlands of Scotland and through which runs the River Cannich. Emerging from the reservoir of Loch Mullardoch, the river flows east to merge with the River Affric at the village of Cannich, their combined waters forming the River Glass.

Downstream of Loch Mullardoch are the smaller natural lochs of Loch a' Bhana, Loch Sealbhanach, Loch Carrie and Loch Craskie through each of which the river flows. Other lochs within the Cannich catchment include (from west to east) Loch an Fraoich-choire, Coire Lochan, Loch a' Choire Dhomhain, Loch a' Choire Bhig, Loch Tuill Bhearnach and Lochan a' Mhill Dhuibh. Within the narrow confines of the eastern end of the glen the river plunges over two waterfalls; Eas Maol Mhairi and Eas an Fhithich. Innumerable burns drain the mountain slopes to the north and south of the river, the largest of which are the Abhainn a' Choilich and Abhainn Sithidh which arise on the eastern slopes of the peak of Sgurr nan Ceathreamhnan.

A minor public road runs up Glen Cannich from Cannich as far as the Mullardoch dam. Other than water capture for the hydro-electric scheme, the major land uses in the glen are forestry and deer stalking.^[1]

Glen Cannich is an important location to the history and martyrology of the Catholic Church in Scotland. Between 1735 and 1746, the Glen was the home and base of operations for three outlawed Roman Catholic priests of the Society of Jesus; Frs. Charles (Scottish Gaelic: Maighstir Teàrlach, an t-Athair Teàrlach Mac Fhearchair) and John Farquharson (Scottish Gaelic: Maighstir Iain,^[2] an-tAthair Iain Mac Fhearchair) and future Catholic martyr Fr. Alexander Cameron (Scottish Gaelic: Maighstir Sandaidh, an t-Athair Alasdair Camshròn).^[3]

Dom Odo Blundell of Fort Augustus Abbey stated that the three priests' residence was located inside a cave under the cliff of a big boulder at Brae of Craskie in Glen Cannich.^[4]

According to Monsignor Thomas Wynne, "It was in the nature of a summer sheiling, a command center for monitoring the traditional activities of cattle reivers; as such it combined a civilising role with the building up of a Catholic mission outside Cameron territory in a way which must have reassured Lochiel on both counts."^[5]

This secret dwelling remained the centre of the Catholic mission in Lochaber at the time, where Fr. Cameron and the two Farquarson brothers secretly ministered to the local Catholics and secretly visited the covert "Mass houses" at Fasnakyle, Crochail, and Strathfarrar (Scottish Gaelic: Srath Farair).^[6][2]

In local Scottish folklore, Fr. John Farquarson remains a popular folk hero. He is said to have once had a face to face confrontation with the Devil upon Cannich Bridge and to have forced his opponent to dive into the River Cannich with a hissing sound.^[2]